Measuring device for tube walls



Feb. 5,A 1935. H. scHUsTER i MEASURIG DEVICE FOR TUBE WALLS Filed Jan. 18', 1934 www,

2 Sheets-Sheet l14 Feb. 5, 1935. H. scHsTER MEASURING DEVICE FOR TUBE WALLS 2 sheets-sheet 2 Filed Jan. 18, 1934 Patented Feb. 5, 1.935l Y PATENTv oFFiCE y i 1,990,138 r "MEAsUitINd DEVICE non vWALLS o Hans Ivmmigrath `(Ndrh.), Germanyv A y Application January 1s, 1934, sea1N0.,707,191 ,1

In Germany October 3, 1932 "s claims.v (ol. ca -14s) I This invention relates to av tongs-like tool for measuring the thickness of the walls of tubes. I'he advantage obtainable by this improved tool ofthe type stated overl measuring tools of the known similar kinds resides therein that means are provided to-securethe accurate Mvertical position of the Vmeasuring pins with respectl to yoneanother whereby the accuracy of the measurement is warranted. For this purpose that leg of the tongs-like tool which enters intothe tube is provided at its end with a measuringpin and the vother leg which remains outside the tubejis provided at its end with an angular member which'- contacts with the outer wall ofthe tube, whereas the outer measuring pin extendsfreely through said angular member and is attached to one leg ofagb'ell-crank lever which lisy turnable on the bolt connecting the two legs of the tongs with p, one another, the other leg of said bell-crank lever transmitting the. measuredtube wall thick-4 ness to a graduated scale attached to an arm projectingforthirom one of the tongs legs. n y

The invention .is illustrated ldiagrammatically` and by `vway'o'f example on f the accompanying drawings on whichFigure 1 islchiefly a side- View of, and partly a longitudinal section through, a tongs-like tube wall measuring `tool designed according tothis invention, the tool being shown in' its position on the tube, and theftube concerned being shown in axial section.' Figure 2 is an upperviewfof'the tool, the bell-crank lever proper (49,y Fig. 41) and the graduated scale (17,; Fig.1) with the arm supporting it 5, (-Fig; 1) being left away. l Figure 3 is a transverse section in the plane III- III of Fig. 1.v Figure-4 isa side-y vieW of another constructional form drawn to a reduced scale,- and the grip portions of the tongslegs being broken ofi'. Figure 5` is a; Viewsimilar Y. to Fig. 1 and shows another modification, some parts at the left-hand end of thev figure being` drawn in section. Figure 5a shows a transverse section through the inner measuring arm (1b) `of Fig. 5. Figure 6 is an upper view ofthe complete' tool, and Figure7 is afrontview ofthe complete tool, seen in the direction from the front-end to the rear or grip end of the same. Y Y

Referring to the constructional form shown in Figs. 1-3,l 1EL denotes the grip-leg of one halfof the tool,.1l is the measuring leg' ofthe same half',"

2a is the grip leg'of the other half of the tool,

and 2b is the operating leg of this half; the two' halves are connected with' one anotherI by the p in Y or bolt 7. Between the grip legs is `ahelical compression spring 16-whic`h tends continually to keepftheselegs apart. At the free end of the measuring leg 1b is the measuring pin 3y which contacts with the inner wallof thetube 13, and to the free end of the leg 2b is attached an angular member 4. n From thegrilgileg-la extends forth, at right angles `with respect to the same, an arm 5, to the end-of: which is attached the indicating device 17 that is provided witha graduatedscale 22 and aY pointer 23 which is under the control of a bolt 25* that is longitudinally shiftable inthe free end of the arm 5. The free end of said bolt isdesigned asa-rack (not shown) -which meshes with a pinion connected with said pointer. Ther bolt 25 is slighily enlarged at its outer end and thisnenlargecll end is held in contact',v with an abutment member 15 by means of a helical spring located `'inside the casing 17 ofthe indicating device, as shown in dottedlines in Fig. 1. j

Y 12 and 14 are the two arms ofthe bell-crank levery 9,;fro1n the middle portion'of which extends forth a forked arm 8, by means of which 'thel bellcrank leverris hinged to the tongs, as shown. The

'before-mentioned abutment member 15 is attached. to the free end of the arm 14 of said bellcrank leven-and in the saine arm is an adjusting screw 10.4 fThe free end-of the `arm 12 of the bell-crank lever is provided vwith thev outer measuring pin 6, 'and in thersame armis an adjusting screw 11. The pin 6 extends `freely through an aperture 20 of the angular member 4.. The adjustingvscrews 10 and 11` serve for limitingjthe magnitude of the angular motion ofthe bellcrank lever legs. y l w Normally, when not in use, the tongs arey kept openby the spring 16.. When the 4legs 1b and 2b havebeen shoved onto the open endof. the tube, the legsxliy and 2a aremove'd towards one another until the measuring pins 3 and 6 contact'with the inner .and the outer'surface `of the tube wall. Owing to the angular shape of the member 4, Athe tube `13 vis securelylocated in .the angle of said member,l and vtherefore also theposition ofthe two measuring pins is practicallya positive oney sojthat both standcorrectly radially with respectlto the,tube.. As the members 25,` 15, 14 and 12 aresubjected to the pressure of the spring in the casing17, the measuring pin 6 is pressed yieldingly against the outer wallo-f thev tube, and according to thefthickness of the `tube wall, the shiitablejbolt 25 is moved out of the casing 17l in which it turns the pointer 23 correspondingly thickness'of the wall upon the'ihner wall of lthe tube (1 3) and contact thereulation of the tool, and in the possibility of measuring the wall thickness at a certain distance from the-end of the respective tube.

In the modification shown in Fig. 4 the graduated scale is provided not at a casing like 17 in Fig. 1, but on a circularly curved lateral extension 18 of the arm 5. The bell-crank lever arm 14 of Fig. 1 is in this case (Fig. 4) transformed into a pointer 19 which cooperates with the scale 18'." 'A helical compressive'spring 21 arranged between the arm 5 and the pointer 19 presses the measuringy pin 6 against the outer surface ofthe tube wall. This spring is a substil tute for the spiral spring inthe casing l?! of Fig. l. The manipulation and manner of action of this'modification is the same as.in,Figs..11`-3. In the further modification shown in 5-71,

the lower measuring pin is"attachednotftoV tongs lleg 1b but to a separate leg `or arm'26 of a bell-crank lever 26, 27 which is supported Joni 22,23 .which'is thensame as that inV 1. 7At

theffr'ee'end of the ftngsfjleg lb are two-*feeling members 29 (Fig. 7)- which are directed towards with when the device is in 4its operative position, as "in Fig. f 5. rI he lower 'or inner 'measuring pin 3 is located' Vbetween said y feelingr members" 29. The position' of Athejpin' 3 Vdeterminea'ofV course,

the positionner the members 2 6 27,1as well as jof the entire indicating,` device (17,^12'22i)j.- The manipulation and manner of actionioffthis 'modi'- iication is practically justv the same asin Figs. 1

y* and 4. It is obviously superfluous` to enter into "f furtherY or'fparticular details in these-r'espectsqf` L15.' A tongs-like device for measuring the thick" ness f ``tube walls, comprising, in combinationv with a tongs-likebody havingv two grip legsandA 2: twofopercating legs, a.` measuring pin associated with the end' of one "of said 1operatingjlegs',janl angularl member `located at the end of Athe/other operating'leg` and 'having itScaVitylocatedl opposite said measuringpin and having, besides, an4 f aperture in its middle portion ;k another measuring pinextending freelythrough said aperture;ia bell-crank lever hinged Vto the connecting 4pivot of the tongs legs, one ofthe arms "ofi-this Alever extendingv over said angular member and having said other measuring pin attached to it; an indieating. device so, arranged relatively to theother arm of 'l said bell-crank lever as tobe adapted to be actuatedrby `the movements .of the same, and` means forV supporting saidindicating device. 2. A tongs-like device` for measuring `the thickness 'of .tubeV walls, comprising,v in combination with'a tongs-like bodyf having vtwo grip legs'and operating legs"v and having its 4cavitylocated opposite said measuring pin and having, besides, an

aperturein its middle portion; another measuring `pin extending freely` thro'ughsaid aperture; .ar bell-crank lever hinged to theconnecting pivot olii-fthe.l tongs legs`,`one of `the` arms ofthis liever extending over said angularmember having said other. measuring pin attached to.it;lthe other .elleeelifeeebeteetlellx einem? .,.lesewer -an ,indicating devicefccrnprising a ircularly 'posite Sad, measuring Dill alldfheving.: 'beeldenof this lever extending' over? said Aangular me from the tongs body; another arm extending substantially parallel to said last-mentioned bellcrank lever arm away fromrthe said body; an indicatingdevi'ce attached to the'end of said parallel extending arm, and means for transmitting 5 the movements of the said other bell-crank lever varm to said indicating device.

"the tongs legs, one of thejarms of this lever extending lover said angular member and havme Seirdfether measuring-pin .attachee teI it;

curved graduatedseeleend a; retary .Y all axially Shifteble "belli elle. .mene 'tor transmit? time Ythe' 11i-levemente @.eeidbelt ,te 'saldpointer; Seid i11dieetns deriee` 'bellsfsld arranged relate; tively ltO the f'ether erm ,0i Seid bell-'emule lever. that its shiftjvibnle boltishad l i by the Senrie,` and means for 'Suppertlrls Sje. dicating device. i c f 41- A 'tongs-like devi'cerfor rneasurinlgh ness 'O'f tuberwells eemprisine.. in Ledmbination with e teneSLlikerbOdY having tw@ erialese'e d. two Operating regs, ameeeutnsfpmfleeete at the endet the, 0f; Seidfeperetm leesen angular.y member located etjthe endet, Otheroi said Operating' leg-S* endhavme; its '.'eevity lee'eted ene? anaperture in its middle portion;l anothe ine urine pin` vextending freely thQush .Seid Tape ture; e bell-Crank. lever hinged t0. sthe..cmlieet-l ing pivot f ofthe tensslrleg's. erleefxthear s 'and having-said other` yeasu'ringpin'jatt cned. to it, and fthemiddl'e pol'tirljof` slaidmbe rank lever beingdeslgned as a `forli* having the. tongs. bodyl supported between 1 its legs :g {the' hellecrarik. leveren@ the temes bedr' beineL ieirit'ed'toone another l-bya common` pivot; 4"an indicating'- de,-y vice so arranged relativelyto thegotli arm of said bell-crankl leveras tobe a tedio', be` actuated lby the "movements offtlie lsame,ifandf means forsupportng -saidindicating device. 5. A tongs-like device-,for measuring hetliickwith atongs-like bodyhavingtwofgriplegs two operating legs, a measuring pin jlocatedl fai?. the. end-of one of'said operatingflegs,"anangular" member `located at the-end fofA the other vrofes'aid operating legs andhaving its ailfityVv located opposite said measuringfpinfandthawing, `besides;` an aperture'inits middleportionanother measuringv pin extending f freely through f Asaid 'afper-l Y ture; a bell-'crank lever hinged to-the connecting pivot of the tongsl'eg-s-,{ of thefarmsl of' this` lever exter-id-ingl -oiier-said-v angular fmerrlberand having said other; measuring pin attached-toit; the other` .arm .l extending.. lsubstantially!at I right angles away.,.-frorn the tongs fbo'dy; yanother arm extending... substantially? i parallel.. i to said.'Y last-lr mentioned bell-crankv lever arm. 1; zwvay; from. the, said body-L indicating devicefattachedto the` end; of said. parallel-[extendinatarmee' snif/table., belt `eurer?Orted, vthe end offsite said. parallel device and being adapted to transmit motion to the movable indicating member of said device; a spring tending to shove said bolt outwardly towards the end of said other bell-crank lever arm, and an abutment member at said lever arm end opposite said shiftable bolt.

6. A tongs-like devicefor measuring the thickness of tube walls, comprising, in combination with a tongs-like body having two grip legs and two operating legs of which that which is to be the inner one during work is channel-shaped in section; a pivot holding the body halves together, an angular member attached to that operating leg which is to be the outer one during Work; said member having an aperture in its ymiddle portion; a bell-crank lever supported on said pivot and having one of its arms extending over said angular member; a measuring pin attached to the end of this arm and extending through said aperture; another bell-crank lever also supported on the said pivot and having one of its arms extending along in said channel; a measuring pin also at the end of this arm; the other arms of both bell-crank lever extending away from the tongs body substantially parallel to one another; a measuring device attached to one of these other arms, and means for transmitting the movements of the other of these arms to said measuring device.

HANS SCHSTER. 

